package com.cjf.filter;
import com.alibaba.fastjson.JSON;
import com.cjf.comon.BaseContext;
import com.cjf.comon.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

//    路径匹配器 支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setCharacterEncoding("utf-8");

        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
//        获取本次请求的url
        String requestURI = request.getRequestURI();
//        定义不需要处理的请求路径
        String[] urls = new String[] {
                "/employee/login",
                "/employee/logout",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
//        判断本次的请求是否需要处理
        boolean check = check(urls, requestURI);
//        如果不需要处理，直接放行
        if (check) {
            filterChain.doFilter(request,response);
            return;
        }
//        判断登录状态 已登录则放行
        /***
         * 后台 管理员、员工登录
         */
        if (request.getSession().getAttribute("employee")!=null) {

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
/***
 * 移动端 前台登录
 */
        if (request.getSession().getAttribute("user")!=null) {

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

//        未登录 则返回登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) {
            boolean b = PATH_MATCHER.match(url, requestURI);
            if (b) {
                return true;
            }
        }
        return false;
    }
}
